Drive device with belt and stepped speed pulley

Details Drive device with belt and stepped speed pulley Drive device with belt and stepped speed pulley

1976-04-16

1977-09-13

Stephan, Steven L.

Undertaking

742423, 274 39A, G11B 360, F16H 708

Patent

active

040477215

ABSTRACT:
A record player drive, comprising a belt pulley concentrically disposed relative to and connected with a turntable, a motor having a motor shaft containing sections of different diameters, and a drive belt connecting the belt pulley with the motor shaft. A guide fork shifts the belt on the sections, and an operating element stepwise sets different turntable-rotational speeds. A holder keeps the operating element in positions corresponding to drive rotational speeds of the turntable, and an elastic coupling is disposed between the guide fork and the operating element for exerting a shifting force on the guide fork when the operating element is moved with blocked guide fork in another drive position. A switch opens and closes the motor electric circuit, and a blocking device blocks the shifting movement of the guide fork, and is coupled with the switch such that with opened electric circuit the blocking is operative and with closed electric circuit is inoperative.

REFERENCES:
patent: 3392982 (1968-07-01), Thevenaz
patent: 3570318 (1971-03-01), Nakadaira
patent: 3838859 (1974-10-01), Estkowski

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